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<p>The powder-feed underwater laser metal deposition (ULMD) of Ti6Al4V alloy was carried out in a local dry cavity generated by a special drainage nozzle, and the influence of laser power and scanning speed on the deposition appearance and geometry characteristics of a single track was investigated. The results show that as the laser power increases, the aspect ratio and dilution rate increase. With the scanning speed increasing, the aspect ratio increases, but the dilution rate and the deposition angle decrease. A high-quality ULMD single track with a uniform appearance and no metallurgical defects is obtained at the laser power of 2.2&#xa0;kW and scanning speed of 14&#xa0;mm/s. In addition, a thin wall part was fabricated using the optimal process parameters. The microstructure of the deposited metal is composed of acicular martensitic <i>α</i>′ phase, and the sizes of the martensitic in the top region are finer than those of the martensitic in the middle region and bottom region.</p>

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Effect of the process parameters on deposition quality of Ti6Al4V titanium alloy by powder-feed underwater laser metal deposition

  • 期刊论文

  • 发表日期：

    2025年9月5日

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  • Xiaofeng Wan,
  • Jiaqi Li,
  • Jinchao Zhang,
  • Tuo Shi,
  • Qingqing Zhu,
  • Mingfu Shu,
  • Yuhang Sun,
  • Qingsong Ding

摘要

The powder-feed underwater laser metal deposition (ULMD) of Ti6Al4V alloy was carried out in a local dry cavity generated by a special drainage nozzle, and the influence of laser power and scanning speed on the deposition appearance and geometry characteristics of a single track was investigated. The results show that as the laser power increases, the aspect ratio and dilution rate increase. With the scanning speed increasing, the aspect ratio increases, but the dilution rate and the deposition angle decrease. A high-quality ULMD single track with a uniform appearance and no metallurgical defects is obtained at the laser power of 2.2 kW and scanning speed of 14 mm/s. In addition, a thin wall part was fabricated using the optimal process parameters. The microstructure of the deposited metal is composed of acicular martensitic α′ phase, and the sizes of the martensitic in the top region are finer than those of the martensitic in the middle region and bottom region.